Radiant electric heating device



Patented .lune 13, 1950 iJN ITED STATES PATENT F Fl CE RADIANT ELECTRIC HEATING DEVICE f Leonard N. Roberson, Seattle, Wash.

Application September 5, 1946, Serial'No. 695,004

(Cl. B19-19) Claims.

lilly inventon-relates-.to electric" heating devices and objects of my invention are to provide electric heating devices of simpleand inexpensive construction that are highly efficient in operation and safe to use.

Another object is to provide a portable screen having electric heating means embodied therein.

Another object is to provide an electric heating panel that is well adapted to be incorporated into a ceiling or wall of a building for the purpose of radiant heating.

Another :object is to provide an electric heat*- ing panel comprising two sheets of corrugated material positioned in face to face contact with their corrugations in intertting relation and having waterproof insulated electric heating elements disposed between said sheets Within the intertting corrugatic-ns of said sheets.

Other objects of this'invention will be apparent from the following description taken in `connection with' the accompanying drawings.

In the drawings Figure 1 is a View in elevation showing a screen composed of three electrically heated panels, the heating elements being diagrammatically shown;

Fig. 2 is an enlargedfragmentary vertical sectional view taken through the top'and bottom portions ofV al section of `aV screen? like. thescreen shown in Fig; l.

Fig. 3 is a detached elevation ofv an electric heating panel used in the screen shown in Figs. l and 2, with the electric heating' elements diagraminatically shown.

Fig. Li is a cross section lof an electricA heating panel similar to the panel shown in Fig. 3.

Fig. 5 is a fragmentary sectional View of a heating panel of a modified form of construction.

Fig. 6 is a fragmentary perspective view,l partly in cross section, showing one'manner of using these heating panels in the radiant heating of buildings.

Like reference numerals designate like parts throughout the several views.

ln the embodimentof this invention shown in Figs. l to 4 each heatingVv panel is made up of two sheets of corrugated, preferably lire proof :rnateriaL such as asbestos.- Preferably each sheet of corrugated `material isofthe single flute type and is made ,upm-oir a corrugated sheet l and a plane llat sheet ill adhesively secured to the corrugated sheet i. Two of the corrugated sheets i are placed in face to face contacting relation with their corrugations interfitting.

An electric heating element 3 embedded in suitable waterproof insulating material, is provided eti-veen the two sheets I and extends back and forth 'within the intertted corrugations of said two sheets, as best shown in Fig. 2. After thel heating elements .13 have been placed between thet corrugated sheets the edge'portions of said sheets that extend transversely of the corrugations are each provided with a U-shapedbinding or edgingfmember G. The binding members Grit overY the sheets ill, as best shown in Fig. 4, and are preferably adhesively secured tothe' sheets I 4. Thesebinding members E form channels I5 for the accommodation-ofthoseportions of the electric heating element which connect the parts' oisaid elementfS that extend back-and forth'in the corrugations.

The heating element 3 in each panel preferably enters the panel atione corner portion and extends back and forth'at spaced intervals across the panel to the other end thereof. Thence said element@ returns longitudinally of the panel inr thechannel I5 formed by cne'of the U-shaped edge binding members E to the same corner portion oi the'panel intowhich it entered. The edge binding members Eiv thus serve to take care'of those portions of the element 3 which extend lengthwise of the panel.

When heating cable 3 is laid in thecorrugated material and another sheet of corrugated material is placed thereon the corrugationsof one sheet are necessarily reversely bent, as shown in Fig. 2. Preferably the two sheets I of corrugated material with the element 3 therebetween are adhesively secured together. However applicant has found` that the corrugated sheets I will hold the laps of this element in place in the absence of adhesive or if the adhesive fails. This is one of the advantages of using two corrugated sheets to hold the heating element.

A type of waterproof insulated heating element commonly known as soil cable is satisfactory for use in these heating panels. The laps of this heating element which extend back and forth in the corrugations of sheets I can be spaced at any desired distance apart depending on the amount of 'heating element desired per unit area ofpanel. The panel can be made directional as respects radiation of heat by positioning all of these laps of heating element in corrugations which curve in the saine direction and which are in contact with the sheet Ill at one side only of the panel.

The sections of the screen shown in Figs. 1 and 2 can be made up by placing one of the heating panels, shown in Fig. 4, Within a box like housing 2, 'which' housing 2 is preferably formed of metal` and encloses the panel like a box and is supportedY in a screen frame 4. As many of the 3 frames l as desired can be hinged or otherwise connected together to forni a lportable screen.

It will be noted that the heating elements 3 shown in Fig. 2 are all disposed within corrugated portions of the sheets l which rest against the surface sheet I4 shown at the left in said Fig. 2, and that this sheet l contacts the left housing member 2. This will render the screen shown in Fig. 2 directional and cause it to radiate more heat to the left than to the right.

Fig. 5 shows a modiiied form of heating panel in which waterproof insulated electric heating elements 3 are disposed between a plain at sheet l and another sheet 5 that is formed to t over the heating elements 3. Preferably the sheets 5 and 7 are formed of nre proof material, such as asbestos. The panel shown in Fig. 5 can be used in a screen in the same manner as the panel shown in Fig. 2.

Fig. 6 shows a method of installing these heat- ,ing panels in a ceiling or wall to provide radiant heating. In said Fig. 6, 9 are licor joists, i9 are lath on said floor joists and l l is plaster. The lath l0 and plaster Il constitute one form of wall finish but other forms of wall finish can be used. The heating panels are placed on the lath l0 and covered with heat insulating material 8 so that substantially all of the heat given off by the electric heating panels will be directed through the plaster and radiated into the room below. Conductors l2 in Fig. 6 connect the electric heating panels with source of electrical energy conductors i3. The panels used in radiant heating, as in Fig. 6, are preferably directional as respects their radiation with the warmer side positioned adjacent the wall finish I9, ll. The radiant heating apparatus shown in Fig. 6 is adapted for installation in old houses of a type now in common use as well as in new construction.

The foregoing description and accompanying drawings clearly disclose preferred embodiments of my invention but it will be understood that this disclosure is merely illustrative and that changes may be made within the scope and spirit of the following claims.

I claim:

1. A heating panel comprising two substantially at sheets of corrugated material positioned in face to face contact and having intertted corrugations; a relatively flat sheet of surfacing material positioned in contact with convex portions of corrugations on one side of said two corrugated sheets; and electric heating elements disposed between said two corrugated sheets and extending longitudinally within corrugations which are in contact with said surfacing sheet whereby a heating element in a corrugation will deliver more heat in the direction of the surfacing sheet than in the opposite direction.

2. A heating panel comprising two substantiallyrflat sheets of corrugated material positioned in face to face relation with their corrugations interiitted; insulated electric heating elements disposed between said sheets and extending longitudinally of the corrugations Within said interiitted corrugations; and U-shaped binding members extending over the lateral edge portions of said sheets, and extending crosswise of said corrugations and providing channels for portions of said electric heating elements that interconnect the portions of said elements in said corrugations.

3.` A heating panel comprising two substantially flat sheets of corrugated material positioned in face to face relation with their corrugations intertting; two plain nat sheets of surfacing material secured to opposite sides of said two corrugated sheets, and electric heating elements positioned between said two corrugated sheets and extending lengthwise of the corrugations back and forth across the panel within concave portions of the corrugations of one sheet of corrugated material and with convex portions of the corrugations of the other sheet of corrugated material in engagement therewith.

4. A heating panel comprising two substantially fiat sheets of corrugated material positioned in face to face relation with their corrugations interiitted; two plain flat sheets of surfacing material secured to opposite sides of said corrugated sheets; insulated electric heating elements disposed between said two corrugated sheets and extending lengthwise of the corrugations back and forth across the panel within concave portions of the corrugations of one sheet of corrugated material and with convex portions of the corrugations of the other sheet of corrugated material re-entrantly bent and fitting over said heating elements; U-shaped binding members tted ovel` the edge portions of said corrugated sheets and said surfacing sheets providing channels along the edges of all of said sheets. said channels being positioned at the ends of said corrugations in said corrugated sheets; and a heat radiating receptacle enclosing said heating panel.

5. A directional heating panel comprising two substantially at sheets of corrugated material positioned in face to face contacting relation with their corrugations intertting; two surfacing sheets supported in contact with opposite sides of said two corrugated sheets, the corrugations of said corrugated sheets being flattened where they engage with said surfacing sheets; and electric heating elements disposed between said two corrugated sheets and extending lengthwise of the interfitting corrugations within concave portions of corrugations that contact one of said surfacing sheets and are spaced from the other surfacing sheet to leave dead air spaces between the corrugations in which the heating elements are disposed and said other surfacing sheet, whereby a major portion of the heat from said electric heating elements will be radiated from the surfacing sheet in contact with the corrugations carrying said elements.

LEONARD N. ROBERSON.

REFERENCES CETED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,439,094.I Gingras Dec. 19, '1922 1,521,241 Hale Dec. 30, 1924 1,570,162 McKeehan et al. Jan. 19, 1926 1,677,240 Kochendorfer et al. July '17, 1928 1,891,595 Grierson Dec. 20, 1932 1,985,965 Wiegand Jan. 1, 1935 2,165,970 Jaspers July 11, 1939 FOREIGN PATENTS Number Country Date 336,994 Great Britain Oct. 22, 1930 OTHER REFERENCES General Electric Review, volume 43, No. 5, 

